harvey l



H. L. LINK.

(MOdeL) LOOK.

Patented June 17, 1890.

l/i/Arra/msr 7 UNITED STATES FFICE.

HARVEY L. LINK, OF DENVER, COLORADO, ASSIGNOR OF TlVO-THIRDS TO CHARLES O. LINK AND ALEXANDER S. BOIVEN, BOTH OF SAME PLACE.

LOCK.

SPECIFICATION forming part of Letters Patent No. 430,189, dated June 17, 1890.

Application filed May 25, 1889. Serial N0. 312,183. (ModeL) To all whom, it may concern:

Be it known that I, HARVEY L. LINK, a citizen of the United States of America, residing at Denver, in the county of Arapahoe and State of Colorado, have invented certain new and useful Improvements in Locks, of which the following is 'a specification, reference being had therein to the accompanying drawings.

My invention relates to an improved form and construction of latch-locks; and its ob jects are to furnish a lock of very simple c011- struction, easily, firmly, and strongly made, readily and quickly applied as a mortise-lock (no chiseling being required therefor) adapted for use as a night-latch, efficient and reliable in action, and affording a good amount of protection against danger of picking or other tampering.

To these ends the invention consists in a lock having a single spring-projected latchbolt, whose retraction is effected by the rotation of a disk moved by the shank of the knob, there being a connection from the disk to the latch-bolt, a key-controlled reciprocating dog being used to prevent the movement of the disk, whereby the latch bolt may be held in a locked or dogged position, and in the other features, arrangements, and con structions more particularlyhereinafter described and claimed.

In the drawings is shown an embodiment of the invention, Figure 1 of such drawings being an elevation of a complete lock closed and ready for use; Fig. 2, an interior plan View, part of the case or shell being removed; Fig. 3, a View of part of Fig. 2 with the mechanism removed; Fig. I, an inner plan view of the cover of the shell; Fig. 5, a section on line 00 a:, Fig. 1; Fig. 6, a section on line 3 y, Fig. 2; Fig. 7, a section on line 2 2, Fig. 2, with the key in place; Fig. 8, a top and side view of wards which may be used; Fig. 9, a top view of the rotating retractor for the latch-bolt; Fig. 10, a section on line 11 o, Fig. 9; Fig. 11, side and top view of the dog; Fig. 12, plan view, on reduced scale, of an escutcheon which may be used.

In the figures, the reference-numerals 1 2 indicate a cylindrical case or shell for receiving and supporting the operative parts.

While they approach even semi-cylinders, in practice I have made one part 1, in which most of the parts are secured, somewhat larger than the other 2, which is in effect the cover for the other, 1 being somewhat more and 2 somewhat less than a half-cylinder, the two when unit-ed, however, forming a complete cylinder. Theymay be formed as mere shells, having proper posts and surfaces for the securement of the lock mechanism in position, or they may be comparatively solid and be chambered out, as at 3 3, for the reception of the parts.

At 4 is a part or lug having an aperture in which takes and telescopes the shank or stem of the latch-bolt 5, whose locking end projecis through the front rim 6 in the usual way, a spring 7 being coiled around the shank between the end of post 4.-and the shoulder of the latch-bolt to keep the latter normallyprojected.

WVithin the case a pin 8 projects up from the latch-bolt, upon which catches the loop or bight of the connector 30, Whose free ends slightly bent over catch upon shoulders 11, formed in or upon the disk 9 by cutting away therefrom the parts thereof at 10 10. Such connection, however, might be made by simply placing the ends of the connector in apertures made in the face of the disk therefor. This disk lies in a suitable seat or recess in the case, so that it is reliably retained in position, yet so that it may be rotated therein by the shank 28 of a door-knobv (Not shown.) At its periphery this disk is formed with a recess 12, adapted to receive the end of a locking-dog 13, arranged to slide in a groove or suitable ways in the body of the case, by which it is held and which negatives the possibility of any transverse motion of the dog,

permitting thereto only longitudinal movement. It is evident then that if such dog be so shot that its end enters the recess 12 the disk will be locked against rotation and the bolt 5 be locked or dogged in the locking po sition. To effect such shooting of the dog, it is formed with a hook end, such hook end herein being the end let, formed by making a recess or cut-away on the upper edge of the dog-bar, such hook end taking in an eccentric slot 15 in a disk 16, seated and adapted IOC to rotate in a suitable seat in the shell. This disk may be arranged to be rotated in its seat by any kind of a key. Preferably, however, I have arranged it to be turned by bits or pins 21 on the end of a key 20, taking in suitable apertures in the web or body of the disk.

It is evident that the mechanism thus far described forms a complete operative latchlock of few parts and simple and efficient construction. To add, however, to its safety and render the task of picking or tampering with it more difficult pieces in the nature and with the function of wards may be added. Such wards 17 are shown in position in Figs. 5 and 7 and in detail in Fig. 8. They are simply plates having recesses 18, formed either by cutting away the metal in the center or by securing legs at the two ends upon one side. Through the web is made a passage for the key enlarged into circular shape at its center. Similar circular, recesses are cut out along the central part of the key-passages through the Wall of the case, shoulders 19 being formed therearound. The shank of the key 20 is reduced in width at points 22, so that such parts may turn in the circular recesses, the intermediate normal-sized parts passing and turning around beneath the shoulder 19 and in the recesses 18 of the wards 17. Then by varying the relative locations of the bits or pins 21, their length, the depth of the recesses 18, and the thickness of the shoulders 19, great variations can be made in the keys, the possible variations in theelements noted affording room for a large number of permutations in the keys. This construction makes a very efficient and reliable night-latch, for the latchbolt mechanism once dogged cannot be operated from the outside until the key be once more inserted and caused to release the dog from the rotating disk That this, however, may be done without the key from the inside and the convenience of use of the lock increased, a piece 23 is secured to pin 8, the piece 23 being arranged at its other end to receive and retain a thumb-piece 24, by which the latch-bolt may be operatedindependently of the other devices.

In Fig. 12 is shown a desirable-and pleasing style of escutcheon which may be used with the lock, being a three-part escutcheon,

with the escutcheons for the thumb-piece, the shank and knob, and the keyhole formed in one symmetrical body, in which the part 31, having the passage-Way for the key, is so secured as to rotate therein with the key.

It should have been noted that if the rotatable disk 16 be slightly flattened on its periphery at two diametrically opposite points, affording lands on which the spring 32 may take, as shown in Fig. 2, the disk will be held secure against danger of accidental rotation, and undesigncd looking or unlocking of disk 9 be guarded against.

By constructing the cover 1 of the ease with a slight lug or projection 25 at its front end, adapted to take in a corresponding recess in the front rim 6, the parts of the case may be firmly secured togetherby a single bolt, rivet,

or screw 26.

The constructions and details thus set out insure not only case and economy of manufacture, but also ease and economy in applying the looks with increased efficiency, reliability, and readiness of use, the lock being well adapted for either a latch-lock, a day lock and a night-latch.

Having thus described my invention, what I claim'is- 1. The combination of an inclosing-case, a spring-projected latch-bolt, a rotating disk adapted to be operated by a knob-shank, a connection thence to the bolt, a sliding dog having a hook end, and a second disk having an eccentric slot receiving the hook end of the dog and adapted to be rotated by a key, substantially as set forth.

2. The combination of an inclosing-case, a spring-projected belt, a rotating disk, a connection therefrom to the bolt, a sliding dog for locking such disk and having a hook end, a second disk adapted to be rotated by a key and having an eccentric slot for receiving the end of the dog, and recessed plates 17 on either side of the second disk and acting as key-wards, substantially as set forth.

In testimony whereof I aflix my signature in presence of two witnesses.

HARVEY L. LINK.

\Vitnesses:

L. F. WILBER, FRED. WV. FELDwIscH. 

